{
    "group": {
        "Description": "group participant",
        "Levels": {
            "1": "HC",
            "2": "CUD" }
    },
    "age": {
        "Description": "age of the participant",
        "Units": "years"
    },
    "sex": {
        "Description": "sex of participants",
        "Levels": {
            "1": "men",
            "2": "women"
        }
    },
    "educ": {
    },
    "educ_yr": {
    },
    "occup": {
    },
    "income": {
    },
    "civil_st": {
    },
    "child": {
    },
    "child_num": {
    },
    "work_thirtydays": {
    },
    "work_threeyears": {
    },
    "laterality": {
    },
    "ed_score": {
    },
    "amai": {
    },
    "amai_score": {
    },
    "admin.route": {
    },
    "years.begin": {
    },
    "coc.age.onset": {
    },
    "days.last.use": {
    },
    "week.dose": {
    },
    "tobc.lastyear": {
    },
    "tobc.day": {
    },
    "tobc.totyears": {
    },
    "tobc.begin": {
    },
    "exclusion": {
    },
    "comm": {
    }
}